<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <title>五子棋</title>
    <!--<link rel="stylesheet" type="text/css" href="css/style.css"/>-->
    <style>
        canvas {
            display: block;
            margin: 50px auto;
            box-shadow: -2px -2px 2px #efefef, 5px 5px 5px #b9b9b9;
        }
        
        .restart {
            text-align: center;
        }
        
        .restart>span {
            display: inline-block;
            padding: 10px 20px;
            color: #fff;
            background-color: #45c01a;
            border-radius: 5px;
        }
    </style>
</head>

<body>
    <canvas id="chess" width="450px" height="450px"></canvas>
    <div id='restart' class="restart">
        <span>重新开始</span>
    </div>
    <!--<script src="js/script.js" type="text/javascript" charset="utf-8"></script>-->
    <script>
            var over = false;
var me = true; //我

var chressBord = [];//棋盘
for(var i = 0; i < 15; i++){
    chressBord[i] = [];
    for(var j = 0; j < 15; j++){
        chressBord[i][j] = 0;
    }
}

//赢法的统计数组
var myWin = [];
var computerWin = [];

//赢法数组
var wins = [];
for(var i = 0; i < 15; i++){
    wins[i] = [];
    for(var j = 0; j < 15; j++){
        wins[i][j] = [];
    }
}

var count = 0; //赢法总数
//横线赢法
for(var i = 0; i < 15; i++){
    for(var j = 0; j < 11; j++){
        for(var k = 0; k < 5; k++){
            wins[i][j+k][count] = true;
        }
        count++;
    }
}

//竖线赢法
for(var i = 0; i < 15; i++){
    for(var j = 0; j < 11; j++){
        for(var k = 0; k < 5; k++){
            wins[j+k][i][count] = true;
        }
        count++;
    }
}

//正斜线赢法
for(var i = 0; i < 11; i++){
    for(var j = 0; j < 11; j++){
        for(var k = 0; k < 5; k++){
            wins[i+k][j+k][count] = true;
        }
        count++;
    }
}

//反斜线赢法
for(var i = 0; i < 11; i++){
    for(var j = 14; j > 3; j--){
        for(var k = 0; k < 5; k++){
            wins[i+k][j-k][count] = true;
        }
        count++;
    }
}

for(var i = 0; i < count; i++){
    myWin[i] = 0;
    computerWin[i] = 0;
}

var chess = document.getElementById("chess");
var context = chess.getContext('2d');

context.strokeStyle = '#bfbfbf'; //边框颜色

var logo = new Image();
logo.src = 'img/logo.png';
logo.onload  = function(){
    context.drawImage(logo,0,0,450,450);
    drawChessBoard();
}

document.getElementById("restart").onclick = function(){
    window.location.reload();
}
chess.onclick = function(e){
    if(over){
        return;
    }
    if(!me){
        return;
    }
    var x = e.offsetX;
    var y = e.offsetY;
    var i = Math.floor(x / 30);
    var j = Math.floor(y / 30);
    if(chressBord[i][j] == 0){
        oneStep(i,j,me);
        chressBord[i][j] = 1;//我        
                    
        for(var k = 0; k < count; k++){
            if(wins[i][j][k]){
                myWin[k]++;
                computerWin[k] = 6;//这个位置对方不可能赢了
                if(myWin[k] == 5){
                    window.alert('你赢了');
                    over = true;
                }
            }
        }
        if(!over){
            me = !me;
            computerAI();
        }
    }
    
}
//计算机下棋
var computerAI = function (){
    var myScore = [];
    var computerScore = [];
    var max = 0;
    var u = 0, v = 0;
    for(var i = 0; i < 15; i++){
        myScore[i] = [];
        computerScore[i] = [];
        for(var j = 0; j < 15; j++){
            myScore[i][j] = 0;
            computerScore[i][j] = 0;
        }
    }
    for(var i = 0; i < 15; i++){
        for(var j = 0; j < 15; j++){
            if(chressBord[i][j] == 0){
                for(var k = 0; k < count; k++){
                    if(wins[i][j][k]){
                        if(myWin[k] == 1){
                            myScore[i][j] += 200;
                        }else if(myWin[k] == 2){
                            myScore[i][j] += 400;
                        }else if(myWin[k] == 3){
                            myScore[i][j] += 2000;
                        }else if(myWin[k] == 4){
                            myScore[i][j] += 10000;
                        }
                        
                        if(computerWin[k] == 1){
                            computerScore[i][j] += 220;
                        }else if(computerWin[k] == 2){
                            computerScore[i][j] += 420;
                        }else if(computerWin[k] == 3){
                            computerScore[i][j] += 2100;
                        }else if(computerWin[k] == 4){
                            computerScore[i][j] += 20000;
                        }                        
                    }
                }
                
                if(myScore[i][j] > max){
                    max  = myScore[i][j];
                    u = i;
                    v = j;
                }else if(myScore[i][j] == max){
                    if(computerScore[i][j] > computerScore[u][v]){
                        u = i;
                        v = j;    
                    }
                }
                
                if(computerScore[i][j] > max){
                    max  = computerScore[i][j];
                    u = i;
                    v = j;
                }else if(computerScore[i][j] == max){
                    if(myScore[i][j] > myScore[u][v]){
                        u = i;
                        v = j;    
                    }
                }
                
            }
        }
    }
    oneStep(u,v,false);
    chressBord[u][v] = 2;
    for(var k = 0; k < count; k++){
        if(wins[u][v][k]){
            computerWin[k]++;
            myWin[k] = 6;//这个位置对方不可能赢了
            if(computerWin[k] == 5){
                window.alert('计算机赢了');
                over = true;
            }
        }
    }
    if(!over){
        me = !me;
    }
}

//绘画棋盘
var drawChessBoard = function(){
    for(var i = 0; i < 15; i++){
        context.moveTo(15 + i * 30 , 15);
        context.lineTo(15 + i * 30 , 435);
        context.stroke();
        context.moveTo(15 , 15 + i * 30);
        context.lineTo(435 , 15 + i * 30);
        context.stroke();
    }
}
//画旗子
var oneStep = function(i,j,me){
    context.beginPath();
    context.arc(15 + i * 30, 15 + j * 30, 13, 0, 2 * Math.PI);//画圆
    context.closePath();
    //渐变
    var gradient = context.createRadialGradient(15 + i * 30 + 2, 15 + j * 30 - 2, 13, 15 + i * 30 + 2, 15 + j * 30 - 2, 0);

    if(me){
        gradient.addColorStop(0,'#0a0a0a');
        gradient.addColorStop(1,'#636766');
    }else{
        gradient.addColorStop(0,'#d1d1d1');
        gradient.addColorStop(1,'#f9f9f9');
    }
    context.fillStyle = gradient;
    context.fill();
}
        </script>
</body>

</html>